Carbon-doped TiO2 photocatalyst synthesized without using an external carbon precursor and the visible light activity

Park, Yiseul; Kim, Wooyul; Park, Hyun Woong; Tachikawa, Takashi; Majima, Tetsuro; Choi, Wonyong

doi:10.1016/j.apcatb.2009.06.001

Cited by 370 publications

(195 citation statements)

References 33 publications

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“…[18,34,[38][39][40]. These peaks were found to be present in both the doped and un-doped samples and must simply be related to carbon contaminants on the surface of the samples.…”

Section: Resultsmentioning

confidence: 99%

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Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Neville¹,

Mattle

Loughrey³

et al. 2012

J. Phys. Chem. C

118

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A series of C-doped, W-doped, and C,W-codoped TiO2 samples have been prepared using modified sol–gel techniques. Reproducible inexpensive C-doping arises from the presence of melamine borate in a sol–gel mixture, whereas W-doping is from the addition of tungstic acid to the sol. The materials have been characterized using elemental analysis, N2 physisorption (BET), thermogravimetric analysis, X-ray diffraction, Raman, X-ray photoelectron, UV–vis spectroscopies, and photocatalytic activity measurements. Doping C and W independently results in an increased absorbance in the visible region of the spectrum with a synergistic effect in increased absorbance when both elements are codoped. The increased visible-light absorbance of the W-doped or codoped materials is not reflected in photocatalytic activity. Visible-light-induced photocatalytic activity of C-doped material was superior to that of an undoped catalyst, paving the way for its application under only visible-light irradiation conditions. A significant fraction of the spectral red shift commonly observed with doped catalysts might be due to the formation of color centers as a result of defects associated with oxygen vacancies, and bandgap-related narrowing or intragap localization of dopant levels are not the only factors responsible for enhanced visible-light absorption in doped photocatalysts. Furthermore, bandgap narrowing through increases in the energy of the valence band may actually decrease photo-oxidation activity through a curtailment of one route of oxidation.

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“…[18,34,[38][39][40]. These peaks were found to be present in both the doped and un-doped samples and must simply be related to carbon contaminants on the surface of the samples.…”

Section: Resultsmentioning

confidence: 99%

“…A wide variety of dopants have been studied including both metallic and non-metallic elements [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Doping of TiO 2 with non-metals (specifically C and N) has attracted significant attention [11, 12, 14, 15, 17-19, 21, 23-25].…”

mentioning

confidence: 99%

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Neville¹,

Mattle

Loughrey³

et al. 2012

J. Phys. Chem. C

118

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“…[27] Depending on its source, carbon can be displayed either as a substitutional anion or as an interstitial cation. [28,29] In the former case, Ti-C bond is observed, while in the latter one C-O (carbonate) bond is more likely. [30,31] Nonetheless, Kirsh et al reported that carbon efficiency is not due to a modification of titania lattice, but carbon species, differently from nitrogen, act as sensitizers, injecting electrons from the dopant to the conduction band of titania.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Synthetic Parameters to Obtain Smart C‐N Co‐Doped Titania Photocatalysts for NOx Abatement

et al. 2017

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Global society is constantly seeking for sustainable and effective processes to fight environmental pollution. The abatement\ud of NO, a class of hazardous contaminants, can be performed by means of photocatalytic oxidation using titaniabased photocatalysts. Non-metal doping is highly desirable for an efficient exploitation of solar light. The co-presence of nitrogen and carbon represents an appealing possibility though their introduction generally requires post-synthesis treatments. Otherwise, in this work carbon and nitrogen have been introduced in titania photocatalysts simultaneously by a onepot synthetic approach using a natural and sustainable source of dopants, namely chitosan. Several synthetic parameters have been changed in order to evaluate their effect on the physicochemical properties of the final materials and to establish structure-activity relationship as for the photocatalytic performances in NOx oxidation under visible light irradiation

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“…The binding energies for the different samples can be found in Table 3. The different BE of O 1s is attributed to the chemically non-equivalent O atoms: O 1s(1) is due to oxygen bonded to metal atoms; O 1s (2) is due to oxygen in metal-OH bonds; and O 1s(3) is due to oxygen bonded to carbon [42][43][44].…”

Section: Materials Characterizationmentioning

confidence: 99%

Characterisation, phase stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles

Mattsson

Lejon

Bakardjieva

et al. 2013

Journal of Solid State Chemistry

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PostprintThis is the accepted version of a paper published in Journal of Solid State Chemistry. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. Citation for the original published paper (version of record):Mattsson, A., Lejon, C., Bakardjieva, S., Stengl, V., Österlund, L. (2013) Characterisation, phase-stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles. The band gap is slightly blue-shifted at high doping concentrations, and red shifted at lower doping concentrations. Formic acid adsorption was used as a probe molecule to investigate surface chemical properties and adsorbate structures. It was found that the relative abundance of monodentate formate compared to bidentate coordinated formate decreases with increasing doping concentration. This is attributed to an increased surface acidity with increasing dopant concentration. Photodegradation of formic acid occurred on all samples. With mode-resolved in situ FTIR spectroscopy it is shown that the rate of photodegradation of monodentate formate species are higher than for bidentate formate species. Thus our results show that the trend of decreasing photo-degradation rate with increasing dopant concentration can be explained by the adsorbate structure, which is controlled by the acidity of the surface. Journal of Solid

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Carbon-doped TiO2 photocatalyst synthesized without using an external carbon precursor and the visible light activity

Cited by 370 publications

References 33 publications

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Tuning the Synthetic Parameters to Obtain Smart C‐N Co‐Doped Titania Photocatalysts for NOx Abatement

Characterisation, phase stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles

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Carbon-doped TiO2 photocatalyst synthesized without using an external carbon precursor and the visible light activity

Cited by 370 publications

References 33 publications

Carbon-Doped TiO2 and Carbon, Tungsten-Codoped TiO2 through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Carbon-Doped TiO2 and Carbon, Tungsten-Codoped TiO2 through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Tuning the Synthetic Parameters to Obtain Smart C‐N Co‐Doped Titania Photocatalysts for NOx Abatement

Characterisation, phase stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles

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Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis